Vibe tests

Chrono/Tests/Tests.cs

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+using Chrono.Model;
+
+namespace Tests;
+
+public class CardDataTests
+{
+    [Test]
+    public void StatEfficiency_CalculatesCorrectly()
+    {
+        var card = new CardData { Cost = 2, Attack = 2, Health = 3 };
+        Assert.That(card.StatEfficiency, Is.EqualTo(2.5f));
+    }
+
+    [Test]
+    public void StatEfficiency_ReturnsZero_WhenCostIsZero()
+    {
+        var card = new CardData { Cost = 0, Attack = 2, Health = 3 };
+        Assert.That(card.StatEfficiency, Is.EqualTo(0f));
+    }
+
+    [Test]
+    public void StatEfficiency_ReturnsZero_WhenAttackIsNull()
+    {
+        var card = new CardData { Cost = 2, Attack = null, Health = 3 };
+        Assert.That(card.StatEfficiency, Is.EqualTo(0f));
+    }
+
+    [Test]
+    public void IsAgent_ReturnsTrue_WhenCategoryIsAgent()
+    {
+        var card = new CardData { Category = "Agent" };
+        Assert.That(card.IsAgent, Is.True);
+    }
+
+    [Test]
+    public void IsSpell_ReturnsTrue_WhenCategoryIsSpell()
+    {
+        var card = new CardData { Category = "Spell" };
+        Assert.That(card.IsSpell, Is.True);
+    }
+
+    [Test]
+    public void ImagePath_UsesPlaceholder_WhenImageFileIsNull()
+    {
+        var card = new CardData { ImageFile = null };
+        Assert.That(card.ImagePath, Is.EqualTo("cards/placeholder.png"));
+    }
+
+    [Test]
+    public void StatEfficiency_RoundsToTwoDecimalPlaces()
+    {
+        var card = new CardData { Cost = 3, Attack = 1, Health = 1 }; // (1+1)/3 = 0.666...
+        Assert.That(card.StatEfficiency, Is.EqualTo(0.67f));
+    }
+}